Pole-changer.



c. 3. Emsksemn v POLE CHANGER. APPLICATION FILED APR.ZZ| 1907- I 0 1,181,656, r Patentei May2,191o I SSHEET i.

c. j. :zmcxsow. POLE CHANGER.

APPLICATION FILED APR.22, 1907- Patented May 2, 191% 2 SHEETS-SHEET 2 UNITED STATES PATENT omen CHz'iaLES J'. ERICKSON, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO FIRST TRUST AND SAVINGS BANK, TRUSTEE, OF CHICAGO, ILLINOIS.

- POLE-CHANGER.

Specification of Letters Patent. 7

Patented May 2, 1916,

Application filed April 22, 1907. Serial No. 369,417.

(lrenerally stated the object of my invention is to provide an improved and highly efficient pole changer for converting a direct current 01' battery current into an alternating current.

Special objects of my invention are to provide an improved arrangement by which the pendulum of the pole hhanger may directly control both the primary circuit of the transformer and the circuit of the opera mg magnets; to provide an improved co.v .i'iction whereby the full voltage of the battery is employed for energizing the operating magnets, and only half or a portion of the battery for energizing the primary coil of the transformer; to provide an improved arrangement whereby the pendulum is adapted to shift the middle terminal of the battery alternately into connection with one or the other of the two ends of the battery, and to interrupt a separate or independent circuit includingthe entire battery; and to provide certain details and features of improvement and combinations tending to increase the general efficiency and serviceability of a pole changer of this particular character.

To the foregoing and other useful ends, my-invention consists'in matters hereinafter set forth and claimed.

In the accompanying drawings, Figure 1 Fig.2. As thus illustrated, my invention comprises a base or body A having uprights or standards a connected by a horizontal bar a. The upright electromagnets B are mounted on the bar a and connected by a yoke Z) of non-magnetic material. The armature C is adjustably secured to the shorter end of the pendulum-rod D,'which latter is rigidly secured to a torsion spring E, as shown more clearly in Fig. 5. The latter is a thin flat springand is secured to the yoke b by the screws 6 which pass through slots or holes in the ends of said spring. The pendulum rodD is provided near its upper end with an enlarged shoulder d. The'portion (Z of the pendulum rod above the shoulder (Z is threaded. The pendulum rod is firmly secured to the spring E by passing the portion (Z through a hole in the center. of the spring and clamping said spring between the shoulder at and a nut 12. The armature C is secured to the upper portion of the pendulum rod by being clamped between the thumb nut 14 and the hexagonal nut 15, the threaded stem (1 passing through a hole in said armature. The pendulum weight d is secured to the lower end of the pendulum-rod, and when the pendulum vibrates it does so against the torsionof the spring E, which latter can be tuned for any desired rate of vibration. The said armature is polarized by a permanent magnet F which has its lower end 7 an insulated enlargement 03* adapted to operate the spring contact J, which latter is secured to and insulated from the bracket 7'. An adjustable contact j is also mounted in the horizontal projection 3' of the bracket 7'; and adapted to engage the spring J, as shown more clearly'in Fig. When the pendulum vibrates the contacts J and j are alternately opened and closed, as will hereinafter more fully appear.

Referring to Fig. 4 it will be seen that the contacts g and g constitute theterminals of the pole changer, and that the opposite poles of the battery K are connected with these terminals through the medium of a suitable switch L, which is shown open.

When the said switch is closed it will be seen that a circuit is immediately completed including said entire battery in series with the coils l and 2 of the ele'ctromagnets, and including the contacts J and j, which are operated by the pendulum. The armature being polarized in the proper manner, such energizing of the electromagnets immediately causes the pendulumto open the contacts J and j, and to close the contacts 9 and H, as shown more clearly inthe dia gram. The opening of the circuit through d the magnets tends to de'e'nergize them, and

the closing together of' the contacts 9 and H closes a circuit-from the negative pole of the ,battery through't hecontacts g and through the armature, through the conductor 3, and the primary 4, of the transformer,

,and through the conductor 5 to the middle point of the said battery. Thisproduces a fiow of current through the said primary in one direction, The armature is retracted by the torsion spring E which'is in the circuit,

' and to an extent to open the contacts g and H, and sufficiently to close the contacts 9 and I, at the-same timeclosing the contacts J and 7". The circuit is thus reestablished through the electromag et, and at thesame time a circuit is closed from the positive pole of the battery through the contactsg' and I, through the armature, through'the conductor 3 and the primary 4, and through the conductor. 5 to'the middle point of the battery. This time, however, the current flow isin the opposite direction, because it is now from the terminal 6 through the primary to the terminal 7, whereas the first time the fioW was from the terminal 7 through the primary to, the terminal 6, by reason of the opposite polarity. In this way the current is alternately reversed. in-the primary 4, with the result that an alternat-' ing current is produced in the secondary .8 of the said transformer or induction-coil.

' I find that a condenser 9 bridged between substituted for the other.

' rents can be used for selective si the terminals 6 and 7 is adapted to increase the efliciency of the arrangement. In this way the pendulum opens and closes its own circuit, which circuit includes the full voltage of the battery. Also, the said pendulum alternately opens andflcloses the two circuits of the primary 4, which'circuits each include only half of: the battery, and the polarity being reversed each time that one is 'With such arrangement the construction is simple and eflicient, and the generating of. an alternating current through the medium ofa direct current in a pole changer is effectively and easily accomplished. These alternating curaling, in

party line telephone systems. ach pole changer can be tuned for a different rateof vibration,'so that dlfierent frequencies can be employed for ringing the diflerentbells on a party line, in any of the well-known ways. Thus it Wlll be seen that two generating circuits are provided for the primary of the transformer, and that these circuits are alternately opened and closed, 'one being substituted for the other .to reverse the flow of current in the primary. It will also-be seen that these alternating generating circuits by which the alternating current is generated in the secondary of the transformer are energized by only half the battery, and that the polarity is reversed each 'timethat one generating circuit is substituted for the other. In this way the full voltage of the battery is employed for energlzing the operating circuit through 'the electromagnets, and only one half of the voltage of the battery forenergiz'ing the "in circuit with said coil.

2. The combination of a battery, a pendulum, a circuit controlled by the pendulum and including the entire battery, amiddle terminal for the battery, means operated by the pendulum for shifting said middle terminal alternately from one end terminal of the battery to the other, the pendulum having a support included in circuit, and a polarized magnet for operating said pendulum.

3. The combination of a polarized electromagnet, a' spring-mounted pendulum, a I

battery, a, circuit including the battery in series with the magnet, a pendulum controlling said circuit, a coil, spring contacts on said pendulum, stationary contacts connected respectively with the negative and positive poles of said battery, adapted to be engaged by said spring contacts on the pendulum, a connection between said pendulum and one terminal of said coil, and a, connection between the other terminal of said coil] and the middle point of said battery, the pendulum having asupport included in circuit.

4. A pole changer comprising a magnet, a

pendulum operated thereby, a polarized ar- I mature rigid with said pendulum, a battery, a circuit controlled by the pendulum and including the entire battery and the winding or windings of the magnetin series, a coil,

a plurality of circuits for said coil, and means operated by said pendulum for opening and closing said circuits and reversing the flow of current in said coil ,the pendulum having a support included in circuit.

5. A pole changer comprising an operatmenses ing circuit, a coil, a plurality of circuits for said 0011, a pendulum provided with means for controlling all of said circuits, a polarized armature rigid with said pendulum, and a support for said pendulum, said support included in one of said circuits.

6. A pole changer comprising an operating circuit, a battery included in said circuit, a pendulum controlling said circuit, a polarized armature rigid with said pendulum, an induction coil having twoseparate circuits, and means operated by said pendulum for including aportion of said battery in one of said circuits, and another portion in the other circuit, the pendulum having a support included in circuit.

7. The combination of a battery, an electromagnetically-operated pendulum, a p olarized armature rigid with said pendulum, a circuit controlled by the pendulum and including the entire battery, a middle terminal for the battery, and means operated by the pendulum for shifting said middle terminal alternately from \one end terminal of the battery to the other, the pendulum having a support included in circuit.

8. The combination of an electromagnet, a spring-mounted pendulum, a polarized armature r1g1d with sald pendulum, a battery,

circuit including the battery in series with the magnet, a pendulum controlling said C11- cuit, a COll, a plurality of circurts for said coil, spring contacts on said pendulum, sta-t tionary contacts connected respectively with the negative and positive poles of said battery, adapted to be engaged by said spring contacts on the pendulum, a connection between said pendulum and one terminal of said coil, and a connection between the other terminal of said coil and the middle ofsaid battery, the pendulum having a support included in circuit.

9. A pole changer comprising an operating circuit, a battery included in said circuit, a pendulum controlling said circuit, an induction coil, and means operated by said pendulum for including a portion of said battery in circuit with said coil, and for subsequently including another portion of said battery in circuit with said coil, and a polarized magnet for operating said pendulum.

Signed by me at Chicago, Cook county, Illinois, this 17th day of April, 1907.

CHARLES J. ERICKSON.

\Vitnesses J. NoRBY, ARTHUR B. SPERRY.

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